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{{Infobox enzyme
| Name = Momilactone-A synthase
| EC_number = 1.1.1.295
| CAS_number =
| IUBMB_EC_number = 1/1/1/295
| GO_code =
| image =
| width =
| caption =
}}
'''Momilactone-A synthase''' ({{EC number|1.1.1.295}}, ''momilactone A synthase'', ''OsMAS'') is an [[enzyme]] with system name ''3beta-hydroxy-9beta-pimara-7,15-diene-19,6beta-olide:NAD(P)+ oxidoreductase''.<ref>{{cite journal | title = Biosynthesis of rice phytoalexin: enzymatic conversion of 3β-hydroxy-9β-pimara-7,15-dien-19,6β-olide to momilactone A |author = Atawong, A., Hasegawa, M. and Kodama, O. |journal = Biosci. Biotechnol. Biochem. |year = 2002 |volume = 66 |pages = 566–570 |pmid = 12005050 |issue=3}}</ref><ref>{{cite journal | title = Identification of a biosynthetic gene cluster in rice for momilactones |author = Shimura, K., Okada, A., Okada, K., Jikumaru, Y., Ko, K.W., Toyomasu, T., Sassa, T., Hasegawa, M., Kodama, O., Shibuya, N., Koga, J., Nojiri, H. and Yamane, H. |journal = J. Biol. Chem. |year = 2007 |volume = 282 |pages = 34013–34018 |pmid = 17872948 |doi=10.1074/jbc.M703344200 |issue=47}}</ref> This enzyme [[catalysis|catalyses]] the following [[chemical reaction]]

: 3beta-hydroxy-9beta-pimara-7,15-diene-19,6beta-olide + NAD(P)+ <math>\rightleftharpoons</math> momilactone A + NAD(P)H + H+

The rice phytoalexin momilactone A is a [[diterpenoid]] secondary metabolite that is involved in the defense mechanism of the plant. [[Momilactone A]] is produced in response to attack by a [[pathogen]] through the perception of elicitor signal molecules such as [[chitin]] [[oligosaccharide]], or after exposure to UV irradiation.

== References ==
{{reflist}}

== External links ==
* {{MeshName|Momilactone-A+synthase}}

[[Category:EC 1.1.1]]
{{enzyme-stub}}

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